KR20000026036A - Interlocking system between networks using different lan protocols and method thereof - Google Patents

Abstract

PURPOSE: An interlocking system between networks using different LAN(Local Area Network) protocols and method the same are provided to have an NI(Network Interface) layer to a protocol stack, in a BRouter device. CONSTITUTION: An interlocking system between networks using different LAN(Local Area Network ) protocols has each network using a MAC(Multiplied Analog Component), LANE(LAN Emulation), an IPOA(Internet Protocol Over Asynchronous transfer mode) protocol. The each network is interlocked each other by a protocol stack composed of an interface layer. A method for interlocking between networks using different LAN protocols comprises the steps of: deciding data information which a network interface layer is inputted; converting the inputted data according to the result; and transmitting data after being converted, to a destination layer. The network interface layer is stacked between a MAC layer, a LANE layer, an IPOA layer, a bridge layer, and an IP(Internet Protocol) layer. The network interface layer comprises the transmitting steps to the destination layer of: deciding a MAC frame, received from the MAC or the LANE or the IPOA layer, and a protocol type of an IP packet, transmitting to the bridge layer or the IP layer, deciding a MAC frame, received from the bridge layer or the IP layer, and a destination port of the IP packet, and transmitting to the MAC or the LANE or the IPOA.

Description

Interworking system and method between networks using different LAN protocols.

The present invention relates to an interworking system and method between networks using different LAN protocols, and in particular, existing LAN (LAN) and LAN Emulation (hereinafter, abbreviated to LANE) and IPOA (IPOA; Internet Protocol Over). Asynchronous transfer mode (hereinafter, abbreviated to IPOA) relates to an interworking system and a method for enabling interworking between protocols.

In general, LANE is a protocol that enables connection between an Asynchronous Transfer Mode (ATM) network and a Local Area Network (LAN), and is a protocol established by the ATM Forum. LANE emulates LAN protocols such as Ethernet or Token Ring in the medium access control (MAC) layer to support all network layer protocols in ATM networks. The service supported on the LAN can be used in ATM networks. In addition, LANE is a data link layer layer protocol that is a lower layer of the network layer. Unlike other interworking methods located above ATM, the MAC layer that is a lower layer of the LLC (Logical Link Control) layer It is located above ATM. LANE can be performed transparently through the existing ATM switch and provides bridging through the ATM network, effectively hiding the network layer and the upper layer from ATM elements. This can handle not only routable protocols but also nonroutable protocols.

LANE divides an ATM network into a plurality of emulated LANs (ELANs) to form a virtual LAN between MAC layers. Since ELANs operate independently of each other, communication between ELANs must go through a router or a bridge, and it provides network boundaries and facilitates network protection and service expansion. In addition, since ELAN is a logical network configuration, terminal mobility and network management can be facilitated with the flexibility of belonging to the same ELAN even if the physical location of the host is changed.

On the other hand, IPOA is also a protocol that enables connection between an Asynchronous Transfer Mode (ATM) network and a LAN (Local Area Network), but is an Internet Protocol Task Force (IETF) in the Internet Engineering Task Force (IETF). Internet Protocol) is proposed protocol to provide on ATM.

In addition, IPOA divides ATM networks into existing subnets, which have the same IP network address and netmask, that is, logical IP subnets (LIS). Mechanisms that translate to corresponding ATM addresses allow the basic nature of the IP protocol to be used without modification. IPOA supports the mapping of IP and ATM addresses using an Asynchronous Transfer Mode Address Resolution Protocol (ATMARP) server, just like IP's Address Resolution Protocol (ARP). ATMARP server in LIS has database for translating IP address into ATM address, and exists as a software module running on file server or workstation, or network device such as router or ATM switch. May exist in Here, ARP is a protocol for mapping an IP address to an Ethernet address, and ATMARP is a protocol for mapping an IP address to an ATM address.

In addition, IPOA directly maps the ATM layer in the network layer, thereby reducing the latency for establishing a connection between the protocol overhead, broadcast traffic, and host, which has been raised in LANE. It improves performance between hosts directly connected to the network.

However, IPOA has a problem that LANE cannot support ATM and existing LAN hosts in ELAN.

In addition, LANE needs to go through a router even if two hosts are directly connected to ATM, causing excessive latency due to delay due to connection establishment, protocol overhead incurred by every hop, and delay caused by the router itself. There is this.

Therefore, since LANE and IPOA, which are conventional technologies, do not interface with each other, only one protocol of LANE or IPOA can be used in an ATM network, and thus the demand for an interface between LANE and IPOA, which are different protocols, is increasing. .

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and includes a network interface (NI) layer in a protocol stack in one BRouter device in an existing LAN and ATM network. It is an object of the present invention to provide an interworking system and method between networks using different LAN protocols for interworking between LANE and IPOA.

In order to achieve the object of the present invention, the present invention uses different LAN protocols, characterized in that each network using MAC, LAN emulation, and IPA protocol is interworked by a protocol stack including a network interface layer. Provides interworking system between networks.

In addition, the present invention comprises the steps of determining the information of the data input network interface layer, converting the input data according to the determination result, and transmitting the data after the conversion to the destination layer It provides an interworking method between networks using different LAN protocols.

Preferably, the network interface layer is stacked between the MAC layer and LANE layer and IPOA layers, which are lower layers, and the bridge layer and IP layers, which are upper layers. In addition, the step of transmitting to the destination layer is the network interface layer MAC frame or IP packet received from the lower layer MAC or LANE or IPOA layer to determine the protocol type (Type) to transmit to the upper layer bridge layer or IP layer In addition, the MAC layer or IP packet received from a bridge layer or an IP layer of which the network interface layer is an upper layer may be determined and transmitted to a MAC, LANE, or IPOA layer, which is a lower layer.

1 is a view showing a connection relationship between a protocol stack and each layer in a browser device according to the present invention.

FIG. 2A is a flowchart illustrating a frame processing process when an NI layer receives a MAC frame from a bridge layer that is one of higher layers according to the present invention. FIG.

2B is a flowchart illustrating a packet processing process when an NI layer receives an IP packet from an IP layer, which is one of higher layers, according to the present invention.

3A is a flowchart illustrating a frame processing process when an NI layer receives a MAC frame from a MAC layer or a LANE layer among lower layers according to the present invention.

3B is a flowchart illustrating a packet processing process when an NI layer receives an IP packet from an IPOA layer, which is one of lower layers.

4 is a diagram showing a connection relationship between an ATM network and a mutual network using LANE and IPOA protocols according to the present invention, respectively.

Explanation of symbols on the main parts of the drawings

1: ATM layer 2: signaling layer

3: LANE layer 4: IPOA layer

5: NI Layer 6: Bridge Layer

7: IP layer 8: MAC layer

9: ethernet layer

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described.

1 is a diagram showing a connection relationship between a protocol stack and each layer in a browser apparatus according to the present invention.

Referring to FIG. 1, a browser (BRouter) according to the present invention is a router capable of both bridging and routing.

First, in the protocol stack of ATM, LANE (3) and IPOA (4) are located at the same level of the layer, all calls are established or released through the signaling layer (2), ATM layer (1) Traffic is transmitted to ATM network through. The IP layer 7 interfaces LAN and ATM, and the LAN is interfaced with the MAC layer and the LANE layer 3, and the ATM is interfaced with the IPOA layer 4.

In addition, the IP layer 7 must classify and process ARP according to an interface. In the case of a LAN interface, an ARP used in an existing LAN is used, and an ATMARP provided by the IPOA layer 4 is used in an ATM interface. The bridge layer 6 has two ports, a MAC layer 8 and a LANE layer 3.

Here, the NI layer 5 functions to connect protocols of each layer, and is a newly created protocol layer for implementing a browser device.

The NI layer 5 determines the protocol type of the MAC frame or IP packet received from the lower layer MAC (8) or the LANE (3) or the IPOA (4) layer, and the upper layer bridge layer (6) or The MAC port or IP packet received from the upper layer bridge layer 6 or the IP layer 7 is determined to the destination port, and the lower layer MAC 8 or LANE ( 3) or to the IPOA (4) layer.

FIG. 2A is a flowchart illustrating a frame processing process when an NI layer receives a MAC frame from a bridge layer that is one of higher layers, and FIG. 2B is an IP of which the NI layer is one of higher layers according to the present invention. A flowchart showing a packet processing process when receiving an IP packet from a layer.

Referring to FIGS. 2A and 2B, when the NI layer 5 receives a MAC frame from the bridge layer 6, which is one of the higher layers (S1), it is determined whether the destination port, that is, the destination interface is a LAN. (S2). In this case, if the destination port is a LAN, the MAC frame is transmitted to the MAC layer 8 (S3). Otherwise, the MAC frame is transmitted to the LANE layer 3.

In addition, when receiving an IP packet from the IP layer 7, which is one of the higher layers (S11), it is determined whether the destination port is a LAN (S12), and if the destination port is LAN, a header is included in the received IP packet. ) Adds the MAC frame (S13) to transmit the MAC frame to the bridge layer (6) (S14), and if not the LAN transmits the received IP packet to the IPOA layer (4).

3A is a flowchart illustrating a frame processing process when an NI layer receives a MAC frame from a MAC layer or a LANE layer among lower layers, and FIG. 3B is an NI layer according to the present invention. A flowchart showing a packet processing process when receiving an IP packet from the IPOA layer.

Referring to FIGS. 3A and 3B, when the NI layer 5 receives a MAC frame from the MAC layer 8 or the LANE layer 3 among the lower layers (S21), it is determined whether the frame type is an IP type. It is determined (S22). In this case, if the frame type is not the IP type, the MAC frame is transmitted to the bridge layer 6 (S24). If the frame type is the IP type, it is determined whether the destination IP address belongs to the LAN IP domain (S23). If belonging to the frame type is transmitted to the bridge layer 6, as in the case that the frame type is not the IP type (S24). If the destination IP address belongs to the LAN IP domain, the header of the received MAC frame is removed (S25), generated as an IP packet, and the IP packet is transmitted to the IP layer 7 (S26).

In addition, when the NI layer 5 receives an IP packet from the IPOA layer 4 which is one of the lower layers (S31), the NI layer 5 transmits the received IP packet to the IP layer 7 (S32).

4 is a diagram illustrating a connection relationship between an ATM network and a mutual network using LANE and IPOA protocols according to the present invention.

As shown in FIG. 4, LIS A, LIS B, and LIS C form different IP domains, and LIS A is divided into LAN A and LAN B divided by an ATM network. It includes a BRouter, a LAN switch, and an ATM terminal to form an emulated LAN (ELAN) for interworking the two LANs. LIS B is a subnet using the IPOA protocol, and includes a router having a browser and an ATM port, and an ATM terminal. LIS C is a subnet consisting only of LAN.

Here, when a browser device for interworking LANE and IPOA according to the present invention is used to connect each subnet as shown in FIG. 4, communication between terminals in the same LIS is bridged. For communication with other LIS, routing is performed, and LANE and IPOA interwork.

The present invention enables interworking between each subnet using each protocol by interworking between the LANE and the existing LAN and the interworking between the LANE and the IPOA protocol as well as the interworking between the LANE and the existing LAN. By applying this method, it is possible to implement a browser device that can efficiently interconnect each subnet using LAN, LANE, and IPOA protocol.

Claims (5)

Interworking system between networks using different LAN protocols, wherein each network using MAC and LAN emulation and IPA protocol are interworked by a protocol stack including a network interface layer. The method of claim 1, The network interface layer is interworking between networks using different LAN protocols, characterized in that the stack between the MAC layer and LANE layer, IPOA layers and the bridge layer and IP layers that are the upper layer. Determining information of data inputted by the network interface layer; Converting the input data according to the determination result; And transmitting the data after the conversion to a destination layer. The method of claim 3, The step of transmitting to the destination layer may include transmitting a MAC frame or IP packet received from a MAC, LANE, or IPOA layer, which is a lower layer, to a bridge layer or IP layer, which is determined by a protocol type. Interworking method between networks using different LAN protocols. The method of claim 3, The transmitting of the destination layer may include transmitting a MAC frame or an IP packet received from a bridge layer or an IP layer of which a network interface layer is an upper layer to a MAC, LANE, or IPOA layer, which is a lower layer. Interworking method between networks using different LAN protocols.